Auto Light Energy Saver Kit with ESP32 + Sensor
ESP32 Energy Saver: Auto Light & Ventilation Control with Air Quality Logging
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Imagine a home that automatically turns off lights when rooms are empty and runs ventilation only when CO₂ or air quality drops — cutting your energy bill without sacrificing comfort. This kit lets you build that exactly: a sensor-driven controller that uses dual PIR motion detectors, a high-accuracy CO₂ sensor, and an MQ‑135 to trigger a 4‑channel relay for lights and an ERV fan, all while logging trend data to a MicroSD card. If you’ve ever struggled with stand‑alone timers or wanted to see exactly when and why your fans run, this project gives you complete control backed by real data.
What You'll Build
You’ll assemble and program a compact control unit that mounts inside a single enclosure. Two PIR sensors feed occupancy patterns to the ESP32, which decides when to switch relay channels to turn off lights in unoccupied zones. Simultaneously, the MH-Z19B measures CO₂ levels and the MQ‑135 monitors VOCs and smoke; crossing a threshold activates the relay channel connected to a ventilation fan or ERV. All events are timestamped by a DS3231 real‑time clock and stored on a MicroSD card, while a 0.96‑inch OLED displays live readings and system status. The end result is a device that shaves hundreds of rupees off monthly electricity bills and keeps indoor air fresh — without any cloud dependency.
What You'll Learn
- Integrate multiple digital and analog sensors with the ESP32 over I²C, UART, and GPIO
- Implement occupancy‑based lighting automation using dual PIR coverage zones and debounce logic
- Calibrate and cross‑validate MH-Z19B CO₂ and MQ‑135 air quality readings for reliable ventilation triggers
- Design a stand‑alone logging system with DS3231 RTC timestamps and MicroSD FAT file writes
Kit Contents
| Component | Quantity |
|---|---|
| ESP32 Dev Board | 1 |
| HC-SR501 PIR | 2 |
| MH-Z19B CO2 Sensor | 1 |
| MQ-135 Gas Sensor | 1 |
| 4-ch Relay Module | 1 |
| DS3231 RTC | 1 |
| MicroSD Module | 1 |
| 0.96in OLED | 1 |
| LM2596 Buck Converter | 1 |
| 100nF Capacitors | 10 |
| 10kΩ Resistors | 10 |
| PCB Prototype Board | 2 |
| Enclosure Box | 1 |
| 12V Adapter | 1 |
| Soldering Iron | 1 |
| Solder Wire | 1 |
Why Buy This Kit Instead of Sourcing Parts Separately
| Factor | Sourcing Separately | Compoden Kit |
|---|---|---|
| Compatibility checks | You verify every part | Pre-tested as a system |
| Build support | Forums and scattered tutorials | AI companion trained on this exact project |
| Time to first working build | Days of debugging | Hours, with step-by-step guidance |
| Shipping coordination | Multiple sellers, multiple delays | One shipment from Bengaluru in 3-5 days |
Who This Kit Is For
This advanced project is tailored for working professionals, researchers, and B.Tech / M.Tech students from ECE, EEE, and Energy Systems who need a robust demonstration of demand‑controlled ventilation and occupancy‑based lighting. It’s also ideal for Smart India Hackathon participants, ATL mentors running advanced workshops, and faculty members at IITs, NITs, VIT, or BITS Pilani who want a complete hardware platform for energy‑audit capstone projects.
Built and Backed by Compoden
Every Compoden kit ships with an AI build companion trained on this exact project — accessible via a QR code on the box, with WhatsApp and email backup. We've spent 10 years building projects for makers, schools, and institutions across India. If a part fails because of a manufacturing defect, replace it free within 7 days.
What if I get stuck during the build?
Scan the QR code to launch the AI companion, which can walk you through every wiring step, code logic, and calibration routine. You can also message our Bangalore team directly on WhatsApp for human assistance.
Can I modify the thresholds for CO2 and air quality?
Absolutely. The provided firmware exposes threshold variables at the top of the code, and the AI companion explains how to adjust ppm limits and MQ‑135 analog‑to‑digital mapping based on your room size and occupancy patterns.
Does this kit require cloud connectivity or an app?
No, the entire system runs locally on the ESP32. Data logs are stored on the MicroSD card, and the OLED shows real‑time values. You can optionally add Wi‑Fi data upload later, but the core functionality is fully standalone.
Is soldering experience necessary?
Yes, the kit includes a soldering iron and two prototype boards because you’ll need to make clean connections for the relay, buck converter, and sensor wiring. The AI companion includes detailed soldering guidance and a beginner’s checklist.
Energy Saving — PIR occupancy + MH-Z19B CO2 + MQ-135 air quality auto-trigger relay-controlled ERV ventilation and log air quality trends.
What's in this kit
Choose your assembly option:
- Soldering Kit — 25W soldering iron, 60/40 solder wire, flux, and small perfboard for permanent assembly.
- Breadboard Combo — 800-point full-size breadboard with 65-piece jumper wire pack for solderless prototyping.
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Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items